200121989 has 2 divisors, whose sum is σ = 200121990. Its totient is φ = 200121988.

The previous prime is 200121973. The next prime is 200121991. The reversal of 200121989 is 989121002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192376900 + 7745089 = 13870^2 + 2783^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121989 - 2⁴ = 200121973 is a prime.

It is a super-2 number, since 2×200121989² = 80097620962632242, which contains 22 as substring.

Together with 200121991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060994 + 100060995.

It is an arithmetic number, because the mean of its divisors is an integer number (100060995).

Almost surely, 2^200121989 is an apocalyptic number.

It is an amenable number.

200121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121989 is an equidigital number, since it uses as much as digits as its factorization.

200121989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 200121989 is about 14146.4479287205. The cubic root of 200121989 is about 584.9224228100.

The spelling of 200121989 in words is "two hundred million, one hundred twenty-one thousand, nine hundred eighty-nine".